Our transcription: Cross-bedding is a sedimentary structure that's very revealing. If we look at a set of cross-beds that are very steep, that are truncated by the next set of cross-beds, then we know that we had a river system or a depositional system that was constantly interrupting itself and shifting around. If we have a smooth progradation of cross-beds, we know there's no interruption, and it's just the steady stream of deposition in more or less a constant fashion.